DS90CF384MTD National Semiconductor, DS90CF384MTD Datasheet - Page 12
DS90CF384MTD
Manufacturer Part Number
DS90CF384MTD
Description
IC, LVDS TRANSMITTER, TSSOP-56
Manufacturer
National Semiconductor
Datasheet
1.DS90CF384AMTD.pdf
(20 pages)
Specifications of DS90CF384MTD
Supply Current
78mA
Interface Type
LVDS
Supply Voltage Range
3V To 3.6V
Driver Case Style
TSSOP
No. Of Pins
56
Operating Temperature Range
-40°C To +85°C
Termination Type
SMD
Filter Terminals
SMD
Rohs Compliant
No
Data Rate Max
455Mbps
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
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AC Timing Diagrams
C — Setup and Hold Time (Internal data sampling window) defined by Rspos (receiver input strobe position) min and max
Tppos — Transmitter output pulse position (min and max)
RSKM = Cable Skew (type, length) + Source Clock Jitter (cycle to cycle) (Note 10) + ISI (Inter-symbol interference) (Note 11)
Cable Skew — typically 10 ps–40 ps per foot, media dependent
Note 10: Cycle-to-cycle jitter is less than 250 ps at 65 MHZ
Note 11: ISI is dependent on interconnect length; may be zero
Applications Information
The DS90C383 and DS90CF384 are backward compatible
with the existing 5V FPD Link transmitter/receiver pair
(DS90CR583, DS90CR584, DS90CF583 and DS90CF584).
To upgrade from a 5V to a 3.3V system the following must be
addressed:
1. Change 5V power supply to 3.3V. Provide this supply to
2. The DS90C383 (transmitter) incorporates a rise/fall
3. The DS90C383 transmitter input and control inputs ac-
the V
and receiver devices. This change may enable the re-
moval of a 5V supply from the system, and power may
be supplied from an existing 3V power source.
strobe select pin. This select function is on pin 17,
formerly a V
rise/fall strobe select pin is connected to V
configured with a rising edge strobe. In a system cur-
rently using a 5V rising edge strobe transmitter
(DS90CR583), no layout changes are required to ac-
commodate the new rise/fall select pin on the 3.3V
transmitter. The V
the device will be configured with a rising edge strobe.
cept 3.3V TTL/CMOS levels. They are not 5V tolerant.
When converting from a 5V falling edge transmitter
(DS90CF583) to the 3V transmitter a minimal board
layout change is necessary. The 3.3V transmitter will
not be configured with a falling edge strobe if V
mains connected to the select pin. To guarantee the
3.3V transmitter functions with a falling edge strobe pin
17 should be connected to ground OR left unconnected.
When not connected (left open) and internal pull-down
resistor ties pin 17 to ground, thus configuring the trans-
mitter with a falling edge strobe.
CC
, LVDS V
CC
connection on the 5V products. When the
CC
CC
and PLL V
signal may remain at pin 17, and
CC
(Continued)
of both the transmitter
FIGURE 19. Receiver LVDS Input Skew Margin
CC
, the part is
CC
re-
12
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